EP 0104941 A2 19840404 - Data storage devices.
Title (en)
Data storage devices.
Title (de)
Datenspeichergeräte.
Title (fr)
Appareil à mémoire de données.
Publication
Application
Priority
- US 42491482 A 19820927
- US 44452382 A 19821126
- US 47559983 A 19830315
Abstract (en)
A data storage device (20) comprises a unitary base casting (21); a plurality of data storage disks (26a, 26b, 26c and 26d), at least one disk having a servo sector prerecorded with two series of alternating servo bursts; a brushless direct current drive motor (24) mounted to the base for rotating the disks; data transducers (63a, 63b, 63c, 63d, 63e, 63f, 63g, and 63h) mounted on a rotary carriage (28); a thermally isolated rotary actuator (40) for moving the carriage means and thereby the transducers; an optical encoder (70) having a housing incorporating a light source (82) and a photodiode array (93) and a scale (100) movable between the source and the array in response to movement of the carriage (28); a peak detector for detecting peak amplitudes of the servo bursts; and programmed digital computer means including an analogue to digital converter for converting the outputs of the photodiode array and peak detector to digital values; processor means for controlling movement of the actuator, via a digital to analogue converter, by counting data track boundaries from the digitised photodiode array signals and track centreline offset values from the digitised servo burst signals to move the transducers between data tracks in accordance with instructions from a user interface and to maintain the transducers in track centreline alignment in accordance with the calculated offset values.
IPC 1-7
IPC 8 full level
G11B 5/55 (2006.01); G11B 5/596 (2006.01); G11B 19/28 (2006.01); G11B 21/08 (2006.01)
CPC (source: EP)
G11B 5/5521 (2013.01); G11B 5/59677 (2013.01); G11B 19/28 (2013.01); G11B 21/085 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 83305785 A 19830927